| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water intake device capable of pumping underground water of a deep part in a small diameter by a large pumping quantity.SOLUTION: A water intake device comprises a casing pipe 1, a water intake pipe 2 arranged so as to form an annular flow passage 12 of a pressurized fluid in the casing pipe 1 and an ejector mechanism 30 for taking out water flowed in the casing pipe 1 via the water intake pipe 2, and the ejector mechanism 30 comprises a diffuser part 13 formed in a tip part of the water intake pipe 2, an annular thick part 14 formed on the inner periphery of the casing pipe 1 and fixing the diffuser part 13 to a rear end part and a nozzle pipe 15 fixed to the tip part inner periphery of the annular thick part 14 and opening a tip injection hole 15c toward the diffuser part 13 at an interval to the diffuser part 13, and the annular thick part 14 is formed with an inflow hole 22 for making the water flow in the annular thick part by penetrating in the radial direction through this, and is formed with a communication hole 23 for communicating the annular flow passage 12 and the nozzle pipe 15 by penetrating in the axial direction through the annular thick part.</p> |
